Acoustic and Vibration Characteristics of Stiffened Finite Cylindrical Shells in Water under Multiple Axial-Excitations

Abstract:

A research on the vibration and acoustic radiation of stiffened finite cylindrical shells in water under a multiple axial-excitations driven was presented. The vibro-acoustic coupling equations of shell under multiple axial-excitations based on Flügge thin shell theory were established. The displacements, surface acoustic pressure and stiffener impedances were expressed in terms of the numbers of normal modals and modes, and considering multiple excitations, the forces were expressed in terms of the numbers of normal modals and modes. Then analytical solution was derived for the vibration and sound radiation from the stiffened shell under multiple excitations. Based on the analytical solution, the influences of excitations’ positions to the vibration and acoustic radiation were investigated. The results show that for double excitations, at high frequencies, the distance between excitations was more large, the average velocity was more low. The results could be used to control the underwater vehicle’s vibration and acoustic radiation.

• Periodical: Advanced Materials Research (Volume 662)
• Pages: 721-725
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.662.721
• Online since: February 2013
• Authors: Qi Zheng Zhou, De Shi Wang, Sheng Yao Gao
• Keywords: Acoustic and Vibration Characteristics, Axial-Excitation, Cylindrical Shell, Stiffener

References

[1] M. C. Junger and D. Feit: Sound, structures and their interaction, second, ed., MIT Press, London, (1986).

[2] Courtney B. Burroughs. Acoustic radiation from fluid-loaded in finite circular cylinders with doubly periodic ring supports. The Journal of the Acoustical Society of America, vol. 75, pp.715-722, (1984).

DOI: 10.1121/1.390582

[3] Tang Weilin, He Bingrong. Approximate analytic solution of vibration and sound radiation from stiffened finite cylindrical shells in water. Acta Acoustic, vol. 26, pp.1-5, 2001 (in Chinese).

[4] Chen Junming, Chen Yingbo, Huang Yuying. Free vibration of longitudinal stiffened cylindrical shell under water. Journal of Huazhong University of Science and Technology, vol. 31, pp.41-44, 2003(in Chinese).

[5] Rosen A, Singer J, Vibration of axially loaded stiffened cylindrical shells. Journal of Sound and Vibration, vol. 34, pp.357-378, (1974).

DOI: 10.1016/s0022-460x(74)80317-2

[6] Mauro Caresta, Nicole J. Kessissoglou. Structural and acoustic responses of a fluid-loaded cylindrical hull with structural discontinuities. Applied Acoustics, vol. 70, pp.954-963, (2009).

DOI: 10.1016/j.apacoust.2008.11.004

[7] Chen Ming, Wang Bin, Cao Weiwu. Research on vibration and acoustic radiation of the submerged complicated shell structure with multiple excitations. Acta Acoustic, vol. 34, pp.498-505, 2009 (in Chinese).